Boiler-furnace



I (No Model.)

F. F. PARSONS.

BOILER FURNACE.

No. 601,880. Patented Apr. 5, 1898.

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Nrrnn STATES FRANOIS F. PARSONS, OF PATERSON, NEW JERSEY.

BOILER-FURNACE.

i I SPECIFICATION forming part of Letters Patent No. 601,880, dated April 5, 1898.

Application tiled August 3l, 1897. Serial No. 650,136. (No model.)

T0 all whom t may concern.'

Be it known that I, FRANCIS EPARsoNs, a citizen of the United States, residing at.

tion of the invention, such as will enable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

My invention relates to improved means for increasing the draft in a furnace, more especially1 in the furnaces attached to boilers.

As it lies in the nature of circumstances it will need no explanation to understand that on so large an area as presented by the average six to twenty-four horse power boiler-furnace it is and always has been difficult to create the necessary draft to facilitate combustion, and consequently obtain the quickest and greatest coefcient of utility, and in still larger boilers it is unnecessary to add that the coefficient of utility grows smaller as the quantity of fuel increases, inasmuch as it has been found difficult to increase the area of the fuel-bed, and consequently as the fuel is closer packed it is more difficult to create combustion. One great point of disadvantage has been the place where the gratebars rest on the supporting cross-bars, and in order to gain at those points the same degree of combustion as at any other point of the grate-surface I have constructed the supporting cross-bars as herein described and illustrated.

A second improvement' in my invention is an intermediate reservoir or air-chamber for the circulating air-draft to pass through, and as I have connected this with flues leading to the supporting-cross-bars, and, moreover, above the fuel-bed as well as beneath it, I claim with this new combination an increased combustion resulting therefrom, although I am aware, of course, that flues passing above and under the fuel-beds are not new. l Finally, I have inclosed a perforated chamber in the fire-bridge for the same purposes and with the same results as above described.

In describing my invention I shall call atten- 'tion to the accompanying drawings, wherein of the chambers shown in Fig. 6.

In Figfl, Aindicates the boiler; B,the brick setting inclosing and supporting the boiler. Inclosed in this latter is a pipe-conduit O, furnished at the top with a Wide-lipped funnel D. The said funnel D can Vbe detached at the top at the support E, to which an airpump can be attached to create an increased draft if this should be desired. The pipe-conduit C connects with the air-chamber F at the side, as seen in Fig. 2. This chamber F is one of three, in this instance, that are riveted or bolted together air-tight, but can of course be multiplied to any number, according to the size of the boiler.

'Ihe end chambers F and F2 are furnished, respectively, with an entrance-aperture G in F and either one or two air-exit apertures I-I' and H2 in F2 and are fclosed on three sides, the fourth, I, which turns inward toward F', being open and with a flange v running all around, said ange being riveted to a similar flange on F. Fis similarly constructed. The center piece F is open on the two sides opposite to each other, and this chamber can of course be multiplied, all in accordance with Vhow much air-space is needed. -v These chambers can be cast,when viewed in section, ao-

cording to a rectangle, as shown in Fig. 6, or a parallelogram, as shown in Figs.l 7 and l.

In conducting the air from the air-chamber one of three courses can be pursued. It can either be led through a pipe connection K into the fire-bridge chamber K', or it can be conducted through the pipe connectionL into the furnace, either underthe fuel-bed or above it, as shown in the illustration in Figs. 1 and 2, or it can be led by a pipe connection M into respectively the perforated cross-bars IDO N, O, P, Q, R, and S. The said cross-bars, having the grate-bars T resting on them, are of the shape shown in the sectional viev7 in Fig. 5, and have the holes U drilled in them for the escape of the air,which then passes up through the fuel-bed. At each end the said bars have an aperture V, to which the pipe connection M is suitably attached. The chamber K in the fire-bridge is, as seen in the sectional View in Fig. 5, of a rectangular shape and furnished with an aperture W at each end to admit of the pipe connection K being suitably attached thereto and has'the upper side perforated with the holes X to permit of theexit of the air led to the chamber through pipe-conduit K. It remains only t0 state that any of these three different methods of leading air into the furnace can be led there individually or collectively, so as to act by itself or jointly with the others,with the understanding, of course, as is shown and described, that the air be first led through the air-chamber composed of sections F, F', and F2, or as many sections of F as might be found practical.

As the description of the pipe-conduits practically has explained the passage of the air, nothing need be repeated more than to say that the air-draft will commence at the funnel D, either naturally or by means of an air-pump, and from thence spread itself into the chambers F, F', and F2,and so on through any of the pipe-conduits, as hereinillustrated and described.

What I therefore, in accordance with the foregoing description and drawings, claim as my invention, and desire to secure by Letters Patent, is-

In the combination of the draft-dues of a furnace With the cross grate-bars, a hollow cross grate-bar, having its upward-slanting sides perforated,'the ends of the said cross grate-bars furnished with holes, a draft-pipe system connecting said bars With each other, substantially as it is illustrated and described, for the purposes as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 11th day of August, 1897.

FRANCIS F. PARSONS.

Witnesses AXEL V. BEEKEN, AUGUST M. TREscHoW. 

